In the previous part I showed how Locke’s argument for government by consent was similar to, and may have even been influenced by, that of St. Robert Bellarmine. I also showed how some of the more well-known early-modern political theorists who dreamed of powerful authoritarian regimes also dreamed of obliterating the Church as an obstacle to their fruition. Now I will argue that there is a clear overlap between the political theory of John Locke, and that of Pope Leo XIII, the pope who is responsible for Catholic social teaching as we know it today. In the final part of this series I will address why these overlaps are important, and what they mean in our contemporary political situation.